MINISTRY OF EDUCATION MINISTRY OF NATIONAL DEFENSE AND TRAINING HANOI MEDICAL UNIVERSITY TU THI THANH HUONG AN EVALUATION OF THE EFFICACY OF ADJUVANT CHEMOTHERAPY USING FOLOFOX4 REGIMEN IN PATIENTS WITH STAGE III COLON CARCINOMA Speciality: Oncology Code:62720149 SUMMARY OF MEDICAL DOCTORAL THESIS HANOI - 2019 THE THESIS WAS FINISHED AT HANOI MEDICAL UNIVERSITY Scientific instructor: Prof Dr Nguyen Ba Duc Judge 1: Judge 2: Judge 3: The Thesis will be defended before Thesis Assessment Council at University Level, in Hanoi Medical University at 2019 The thesis can be searched at: The National Library Hanoi Medical University Library National Library of Medicine dated LIST OF RELATED MANUSCRIPTS Tu Thi Thanh Huong, Nguyen Ba Duc, Do Anh Tu et al: Clinical and subclinical characteristics and unwanted side effects on patients with stage III colon cancer who underwent radical surgery received adjuvant treatment with FOLFOX4 regimen Vietnam Journal of Oncology, vol.2, the 16th National symposium on cancer prevention, 121-26 Tu Thi Thanh Huong, Do Anh Tu et al: Initial assessment of the efficacy of adjuvant chemotherapy using FOLOFOX4 regimen in patients with stage III colon carcinoma who had undergone radical surgery at Vietnam National Cancer Hospital Vietnam Journal of Oncology, vol.2, the 18th National symposium on cancer prevention, 155-16 RATIONALE Colon cancer is a common disease in developed countries, and tends to increase in developing countries According to International Agency for Research on Cancer IARC (Globocan 2018), there are estimated to have been 1.849.518 new cases and 880.792 deaths due to colon cancer each year It indeed is the third common disease in men, the second in women, and the second leading cause of cancer - related deaths worldwide It is estimated that in Vietnam in 2018 there were approximately 5.458 new cases in both men, It indeed is the five common disease in the both men, the second in women and the five in the men The risk of death of colon cancer is directly related to metastatic risk factors The disease spreads via three main routes which are localization of the primary tumor, blood stream, and lymphatics Among them, lymphatic spread is the main metastatic patterns with 37% of colon cancer lymph node metastases Lymph node metastasis is always a bad prognostic affecting treatment outcomes Surgery is the basic treatment in which lymphadenectomy plays a significant role, surgery is the on-site treatment That adjuvant chemicals have a great role to eliminate microscopic metastases and reduce risk factors for recurrence has been proved, they help to increase disease - free survival time as well as the overall survival time especially that of patients with stage III colon cancer The introduction of new chemicals has brought many opportunities for colon cancer patients with lymph node metastasis Many chemotherapy regimens are being used, yet defining which regimen is the most effective is still being studied Adjuvant chemotherapy plays an increasingly important role in the treatment of postoperative colon cancer, especially clinical studies showed that it brings beneficial for patients with stage III colon cancer INT-0035 study which was performed in 1990 aimed to compare two groups of surgery alone or 5FU and leucovorin in patients with stage III colon cancer The adjuvant treatment with 5FU and leucovorin decreased the risk of cancer recurrence by 41% Patients receiving 5FU and leucovorin had a 5year survival rate of 60% as compared to 46.7% in those patients undergoing surgery alone SEER data on the relationship between the disease duration and survival time identified 119,363 patients with colon cancer in the United States of America from 1991- 2000 The results showed that 5-year stage-specific survivals were 83% for stage IIIA, 64% for stage IIIB, 44% for stage IIIC The MOSAIC study (2009) was a multicenter study, patients were divided into groups: 40% of high - risk stage II and 60% of stage III colon cancer, receiving FOLOFX4 adjuvant therapy, followed up 82 months The 5-year disease - free survival rates for patients with high-risk stage II and stage III were 73% and 67% respectively Vietnam National Cancer Hospital (also known as Hospital K) has been applying adjuvant chemotherapy using Oxaliplatin regimen in patients with stage III colon cancer since 2007, the disease - free survival time as well as the overall survival time have been improved But so far, there has not been a thorough and comprehensive study of the results of adjuvant chemotherapy after colon cancer surgery Therefore, the author conducted a study of applying adjuvant chemotherapy using FOLFOX4 regimen for stage III colon cancer, with the two following objectives: Evaluate results and prognostic factors of adjuvant chemotherapy using FOLOFOX4 regimen in patients with stage III colon carcinoma Evaluate unwanted side effects of the regimen NEW CONTRIBUTION OF THE THESIS - Adjuvant chemotherapy using FOLOFOX4 regimen in patients with stage III colon cancer improved disease-free survival (DFS) The - year DFS was 73.6%, the average DFS time was 36.9 months; 5-year overall survival rate was 74.5% and the average overall survival time was 59.2 months - The 5-year OS of patients with stage IIIa, IIIb and IIIc was 84.8%, 71.8% and 57.1%, respectively (p=0.049) The DFS after years of patients with stage IIIa, IIIb and IIIc was ; 89.1%, 69,2% and 47.6%, respectively (p=0.001) The OS and DFS in different stage were considered statistically significant difference (p